Hack-saw frame



June 30, 1925.

C. SPRAGUE HACK SAW FRAME 'Fired June 28, 1925 UE.' mnron ATTORNEYPatented June 30, 1.925,

UNITED STATES PATENT oFElcE.

CLIFFORD vSFRAGUE, OF NEDERLAND, COLORADO.

an object of the invention Vis to provide aA hack saw in which thesawing blade may be positioned in the ordinary position parallel withthe back of the frame or may be po sitioned transversely to its normalposition for lateral sawing.

In many instances, sawing work is necessary which ispracticallyinaccessible by an ordinary approved type of hack saw andalso it is frequentlv desired to cut substantially square openings inrigidly mounted boards or the like and such sawing work is materiallyfacilitated by r the/provision vof saw support-ing means adjustablycarried by the frame of the saw in such manner as to permit quick andeasy adjustment of the saw blade from its normal position into ahorizontal or transverse position.

Another object of the invention is to provide a hack saw and frame asspecified which is comparatively simple in construction, in which thenecessary "adjustments, may be quickly and easily made to accommodatesaws of different lengths andalso to provide a hack saw frame which maybe manufactured at a comparatively low cost.

Other objects of the invention will appear in the following detaileddescription taken in connection with the accompanying drawings whereinFig. 1 is a side elevation of the improved hack saw showing a bladeassociated therewith.

Fig. 2 is a detail longitudinal section von the line 2*-2 of Fig. l.

Fig. 3 is a detail section on the line 3 3 HACK-saw FRAME.

' Application led June 28, 1923. Serial No. 648,335.

Fig. 6 isa detail section through a modified form of the invention.

F ig. 7 is a fragmentary detail View of a modified form of the inventionshowing a pistol. grip handle for the saw frame.

Referring more-pailticularlyto the drawings, the improved hack sawincludes'the back or frame 1, whichis substantially U shaped and hasparallel legs 2. As is usual inthe construction of adjustable hack sawframes the frame or back 1 is constructedof two sections namely thesection 3 and the section .4 which are adjustably connected and kheld inadjusted positions by means of a. thumb screw 5 which is carried by aguidingcollar 6. y 1

rlhe handle carrying leg` 2 extends diametrically through a bolt l0,which bolt is pro'- vided 'with two transverselyv extending dia-`metrical slots l1, and the bolt is cut away-at opposite lsides of itsaXis and the slots for substantially kone-fourth of its body,

as shown inFig. 3 of the drawings, so as to permit the leg 2 to bevquickly inserted through the bolt. The bolt extends into a recess 12formed in the handle 13 and it threads through a threaded disc like nut14 which abuts the ferruler 15'. The ferrule 15 is mounted upon thehandle 13, as clearly shown in Figs. 1 and 3 of the drawings. A

clamping nut 16 is threaded upon thevbolt 10 and is adapted to clampagainst 'one edge of the leg 2 and tightly force the legv against thenut 14 for securely connecting the handle 13 to the framel in suchmanner that it may be quickly and. easily detached therefrom. A setscrew 17 'which has a relatively large head 18 is'threaded into the endof the leg 2 and the head 18 has a diameter greater than the thicknessof the leg, and also than the width of the slot 11v so as to prevent thebolt 10 and the handle 13 from' fallingoff the leg 2 when the clampingnut 16 is not in clampi ring position.4 The outer end of the bolt 10 fis flattened and `has a tongue`19 formed thereon which is adapted to beinserted through the opening 20 in one end of the saw blade 21 to permitattachment of the saw `blade to the bolt.

The oppositeend of the saw blade 21from that which is attached to thebolt 10, is conn ected or attached by means ofa tongue 22 lll to the latend 23 of a meinber 24. The inember 24 is provided with diametricallyeX- tendiiig slots 25 which extend at right angles to each other,and themember 2a, like the bolt 10 is cut away at diagonally opposite places,for substantially one-fourth of its body, as clearly shown in Fig. l ofthe drawings.

A washer 26 is provided which is likewise out, and it fits between theouter end 27 of the member 24 and the' facing edge of the leg 2 ol' theframe 1, which is inserted throughone oli the slots 25. The leg 2 has aset screw 28 tlireaded'iinto'its lower end, the

head 29' ol' which lia-sa diameter greater 'than the'thiokiiess ot theleg and also greater than the width ot the slot 2 so :is toprevent themember 2l`lron'ifalling oil'the leg 2.

The cutting away of the"substantially two quarters et'themember 24 andthe bolt 10,

atV diagonally oppositey portions of this member and bolt will 'permitquick adjustment of the saw blade 21 from its normal positionparallellwithfthe back of the saw frame, as

i shown iii/Fig.; A of the drawings in solid lines, into horizontalposition transversely of the saw raim'e'asshownvin dottedlines'in Fig. 5of the drawings.

lnfFig.. 6 of' the drawings a slight modiirisation:'ot tlieinventiron-is shown inf which :thel member' 24 whichcorresponds to theV memberv 24and which member alsocorrespondsto 'thebolt 10 lis ys-liowir as`provi-dedwith a pair ot difa'inetricazlfly` extending slots 1 25whicliiaife' disposed at right angles oiieto ther otherf'an'di which areadapted to rece-ivo the leg2 therethrough. A pin '30 is in.sertedthi-oughi the leg to `prevent the 'inemf ber 2li" lfrom yallingoff the leg when the blade is not. properlyr tightened.

In the 'mediied form shown` in Fig. 6 of the drawings, it will benecessary to removethennemb'er 24. from od the end 2: ot thefframe'to'tuinit topositionthe saw horizontally'.

In Fig. 7' ot the drawings, the further modified torinof they inventionis shown, which is designed toi-adapt the Vsaw frameto'theuse of apistolgrip, as indicated at BO'. The pistol grip'() is connected inl anyapproved nvianner to thebaclt 1 Vot'tli'o saw fra-me and the saw' bladecarrying bolt 31.l threads into the pistol'grip.

Frein ythe'foregoing`v description taken: in

' connection with' theacconipanying drawings it will be apparent that'the saw blade 21 may be easily and quickly mounted in position, andvconnected to the tongues 19l and 22 prior to the `connection' otl the,saw blade to the tongues, the` trame y1 is adustable to substantiallyfit the saw blade after which thc blade is tightenedbyvturning thehandle, to securely tighten the saw blade after which the leg- 2fistightly clamped in position by adjustment of the mit 16. When it isdesired to adjust the positionol the saw blade into horizontal 'from avertical position or vice versa, the handle is rotated to release thetension of the saw slightly, and the bolt and member 24, are' tui-ned ahalt' turn causing abutment ot the walls 'formed by the cutting away ofthe boit and ineiiiber against the ends 2v ot' the saw iframe, afterwhich the bolt is again tightened to tension the saw blade and hold itsecurely in hori- Zon-tal sawing position.

It is, of course, to be understood that the invention may be constructedinother manners andthe-parts associated in vdifferent relations'and,therefore, I do not desire to-be l-iinited i-ir any manner except as set'forth in' the claiinshere-u-nto appended.

Having thus described my invention what I claim is:-

1. A hack saw Yframe including a back having parallel legs, arboltprovided with a diainetrica-lly extending opening adapted to receive oneof said legs therethrough,

mea-ns on said bolt ifor clamping against the Y edges-off the leggaysubstantially oylindi-ical member provided with Ya diametricallyextendingopeningi adapted` to receive the other leg offthe tra-me, andsaw connecting means carried by said bolt and member.

2. A hack saw frame-comprising. a sube stantially U shaped back havingparallel legs, a handle,fa AboltYadjustablerelative to said 'handle andprovided with Aa Vpair of diametiica-lly extending openings adapted toreceive one of said legs therethrough, a clamping Vnut adjustable onsaidV bolt for clamping' engagement with said'leg, af membei' provided.with a pair of diainetifically extending openings disposed at rightangles to veach other and adapted tol receive the other of said-legstherethrough, and saw connectingmea-ns carried'by said bolt and meinber.

3. A hack saw ti-ame comprising a siibV stantially U shaped back havingparallel legs, a handle, fa bolt adjustable relative to said handle vandVprovided with a pair ot diameti-ical-ly extending openings adapted toYreceive one of said legs therethrough, a

clamping nut adjustable on said .bolt tor clamping. 'engagement"withsaid leg, a vmember provided with. ar pair of'diameti'ically ex.-tending openings disposed at right angles tol eachotherandadaptedtoreceive the other of said legs therethrough, saw connectingmeans carried bysaid bolt and n'ieinbei', and means carried by said legsloi' preventing the bolt or member 'trom falling oil the ends of thelegs.

l. AVv hack saw frame comprising a substantially U shaped back havingparallel legs, a handle, Va bolt adjustable relative to said handle andprovided. witha pair of diameti'ically extending openings adapted' toreceive one of .said legs therethroi'igh, a

clamping nut adjustable on seid bolt for clamping engagement with saidleg, a member provided with a pair of diametrioally extending openingsdisposed et right angles to each other and adapted to receive the otherof said legs. therethrough, saw connecting means Carried by said boltand member, means carried by said legs for preventing .with the frameleg engaged through the member.

In testimony whereof hereby affix my signature.

' CLIFFORD SPRAGUE.

